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asciitopgm - convert ASCII graphics into a portable graymap
asciitopgm
[-d divisor] height width [asciifile]
Reads ASCII data as input.
Produces a portable graymap with pixel values which are an approximation
of the "brightness" of the ASCII characters, assuming black-on-white printing.
In other words, a capital M is very dark, a period is ver light, and a
space is white. Input lines which are fewer than width characters are automatically
padded with spaces.
The divisor argument is a floating-point number by which
the output pixels are divided; the default value is 1.0. This can be used
to adjust the brightness of the graymap: for example, if the image is too
dim, reduce the divisor.
In keeping with (I believe) Fortran line-printer
conventions, input lines beginning with a + (plus) character are assumed
to "overstrike" the previous line, allowing a larger range of gray values.
This tool contradicts the message in the pbmtoascii manual: "Note that
there is no asciitopbm tool - this transformation is one-way."
The table
of ASCII-to-grey values is subject to interpretation, and, of course, depends
on the typeface intended for the input.
pbmtoascii(1)
, pgm(5)
Wilson
H. Bent. Jr. (whb@usc.edu)
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